要在写作中要根据上下文进行适当替换。

　　开头：

　　When it comes to …, some think …

　　There is a public debate today that …

　　A is a common way of …, but is it a wise one?

　　Recently the problem has been broughtsintosfocus.

　　提出观点：

　　Now there is a growing awareness that…

　　It is time we explore the truth of …

　　Nowhere in history has the issue been more visible.

　　进一步提出观点：

　　… but that is the only part of the history.

　　Another equally important aspect is …

　　A is but one of the many effects. Another is …

　　Besides, other reasons are…

　　提出假想例子的方式：

　　Suppose that…

　　Just imagine what would be like if…

　　It is reasonable to expect…

　　It is not surprising that…